Padlock



UNITED STATES VPATENT, OFFICEO EDWARD T. FRAIM, OF LANCASTER, PENNSYLVANIA.

PADLOCK.

SPECIFICATION forming part of Letters` Patent No. 240,586, dated April 26, 1881.

Application filed October 29, 1880.

T0 all whom it may concern:

Be it known that I, EDWARD T. FRAIM, a citizen of the United States, residing at Lancaster, in the county of Lancaster and State of Pennsylvania, have invented certain new and useful Improvements in Locks, of which the following is the specification. i

My invention relates to improvements in that class of locks in which a U-shaped bail or shackle with entering notches cut in both arms thereof is held in the case by means of a number of tumblers resting upon stationary' plates, the whole series of which are held together by means of a spiralspring resting on the bottom plate of the case; and the objects of my improvements are, first, the steadying ofthe upper end of the key in the case while turning the tumblers, and, second, to prevent the shifting ofthe tumblers from their places on the stationary plates. I accomplish these objects by the mechanism illustrated in the accompanying drawings, in which` Figure l is a side view of the lock; Fig. 2, a longitudinal section of the same, showing the manner of keeping the fast,arm of the shackle in the case. Fig. 3 shows the fast arm of said shackle before it is pnt into the case. Fig. 4 is a view of the upper surface and a section of the plate by means ot' which the upper end of the key is steadied while turning the tumblers. Fig. 5 is a view of the bearing-surface of the stationary plates and tumblers. Fig. 6 is ahorizontal section of the lock-case and the interior vertical ribs. Fig. 7 is a key of the lock, and Fig. 8 a transverse section of the lock with all the parts ofthe mechanism in place.

Similar lettersrefer to similar parts throughout the several views.

The fast arm of the shackle B (understood in this specification as the one which is permanently retained in the lock-case A) is cast with a circular opening, P, Fig. 3, in the end thereof, and after it is introduced into the case A the metal surrounding said opening I? is (Model.)

with both ends of each plate between two of `5 5 the ribs I. The rst put into the case is the stationary plate It, Fig. 4, which has a circular opening, a, through the center, and one face of which is flat and the other concave. It is inserted with the concave side vtoward the top of the case, to avoid the effects of the irregularities in the casting of the top Z1,'by resting against it as little of the surface of the plate as possible. When the key, Fig. 7, is introduced in the lock, the central circular opening, a, of the plate R receives and holds in place the end m thereof, which is likewise circular.

'Ihe lookin g mechanism consists of stationaryplates C, having circular ribs d, upon which plates rest revolving tumblers F, with hubs l, which fit and operate in the countersinks formed by the said ribs cl. These tumblers F and plates G are placed in the case A alternately, both having central openings, K, through which the key passes. In this arrangement the hubs lof the tumblers F are retained in their proper positions by means of the circular ribs d of the plates C.

What I claim as my invention, and desire to secure by Letters Patent, is

The plate It, with a circular opening, a, in the center, and having one face flat and the other concave, in combination with the case A, having ribs I, and the end m olf the key, for the purpose of receiving and holding the key in place.

EDW. T. FRAIM. Witnesses:

W. B. WILEY, WM. R. GERHART. 

